Tables - ISO 4406 / SAE AS 4059 / NAS 1638
HYDAC Filtersysteme GmbH
en
Page 90
BeWa CS1000 3247149l en.doc
2007-02-01
17.3 NAS 1638
Like ISO 4406, NAS 1638 describes particle concentrations in liquids. The analysis methods can be
applied in the same manner as ISO 4406:1999.
In contrast to ISO 4406, certain particle ranges are counted in NAS 1638 and attributed to
measurement references.
The following table shows the cleanliness in relation to the particle concentration determined.
Maximum Particle count / 100 ml
2..5 µm
5..15 µm
15..25 µm
25..50 µm 50..100 µm
> 100 µm
00
625 125
22
4
1 0
0
1,250
250
44
8
2
0
1
2,500 500
88
16
3 1
2
5,000
1,000
178
32
6
1
3
10,000 2,000
356
64
11
2
4
20,000
4,000
712
128
22
4
5
40,000 8,000
1,425
253
45
8
6
80,000
16,000
2,850
506
90
16
7
160,000 32,000
5,700
1,012
180
32
8
320,000
64,000
11,400
2,025
360
64
9
640,000 128,000
22,800
4,050
720
128
10
1,280,000
256,000
45,600
8,100
1,440
256
11
2,560,000 512,000
91,200
16,200
2,880
512
12
5,120,000
1,024,000
182,400
32,400
5,760
1,024
13
10,240,000 2,048,000
364,800
64,800
11,520
2,048
Contaminations level
14
20,480,000
4,096,000
729,000
129,600
23,040
4,096
The values in the table show the particle count of a 100 ml sample.
Increasing the class by 1 causes the particle count to double on average.
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